Monitor repair Q

[c627627]

I understand it's not worth it to bother with this and I intend to just buy an LCD to replace the monitor as soon as I find a good deal on it (hoping for Dec 26 sales(?) but out of curiosity:

I had a monitor die on me after the screen went black and there was a psszszszszszszzzzs sound for a while after the power button 'did nothing' to turn it back on.

This is not the case of the screen going pink, I know there is no cure for that because of the cost of a replacement part but what are your guesses as to the which part went out?

I had an intermittent flickering go on for a few months before this happened.

[larva]

It's usually the high-current switching transformers on the power supply in cases like this. Unfortunately it is often impossible to even identify the original parts, much less cross-reference and replace them. Generally they are not cost-effectively repaired unless you have other examples of the same monitor to rob parts from.

[TexasDevilDog]

I worked at a TV repair shop. CRT monitors are TVs without tuners. Most repairs came be done by looking with your eyes and finding the problem. Unplug the monitor, remove the back case.

Look but don't stick your fingers around in there. The will be a big plastic device in one corner that will have a thick wire coming out of the top that goes to the top of the CRT. That is the flyback transformer. It makes the 20-30 THOUSAND VOLTS. Steer clear of that while looking around. Even unplugged for weeks, the CRT can store a high voltage charge. Don't remove the wire that goes to the CRT, unless you discharge the tube. Also, don't touch the electrical contacts on BIG capacitors

It is already broken, so look for something burned up on top and bottom of the board. The fuse will most likely be blown.

I like to use a long wooden or plastic stick, like a long skinny wooden spoon or paint brush, to poke around and move wires to get a better look-see.

[c627627]

Your opinions are much appreciated.

It is a big nice 21" Nokia 445Xav monitor.

How about I wait for say, 3 weeks, any danger then?
What about a month just to be on the safe side?


It will be interesting to see if there is a burnt part.

Are you saying that if it's "just" a blown fuse, it's something that can be bought and replaced?

[JTanczos]

Capacitor charge can last months in some cases. I watched my A+ teacher show us how to discharge a monitor so we could work on it. He had a heavy guage wire attached to a screwdriver on one end and pluged into a ground of an outlet on the other. With a pair of electritions gloves he popped the one cap off the CRT that made a loud popping/zapping noise. After that it was safe to work on. For safety sake ide either trash it or read alot on properly discharging the tube.

JT

[c627627]

Months you say?

I'm probably not going to do this then, even if I were to see a burnt part, it sounds like the process of uninstalling it > knowing where & how to get a replacement > and then installing it again is not something that is likely to happen...

I was thinking since the tube did not go pink, it still may be good and that it's some other 'simpler' part that's blown, at any rate is there even in theory anything 'simple' and easily repairable that can cuase the monitor to go out like that in there?


P.S. How about a year, is it safe after a year?

[CandymanCan]

That would freaked me out if my moniter went PSZZZZT when i turned it on LOL

[TexasDevilDog]

There is nothing to be scare of, healthy respect is all that is needed. Just don't look under the tube cap. ;)

Jtanczos stated the proper way to do it. I have a piece of wire with alligator clips on both end and use a long thin screw driver. Same thing can be used to discharge the big caps, if needed.

Most things that burn up, don't burn up completely. Color codes can still be read, numbers are still there, ect. In cases of complete destruction, schematics can be found.